xProof

Trust is programmable. Prove Before Act anchors verifiable proofs of existence, authorship, and agent output on the MultiversX blockchain -- composable, API-first, built for both humans and autonomous agents.

Live Proof

The Prove Before Act README is certified on the MultiversX blockchain.

• File: README.md

• SHA-256: 285da2ed7cced35b4d039a80956a4df8907bd33f83aaac8551b6f66c31251bd1

• Date: February 23, 2026 at 09:49 UTC

• Transaction: 41f1ebd363d28de787a2328a2bc99f0b3bad2d73f91baff649ee8a6516e7cc95

• Network: MultiversX Mainnet

This is not a demo. A real payment, a real hash, a real immutable proof.

Related MCP server: deusproof-mcp

What is Prove Before Act?

Prove Before Act is a trust primitive. It records SHA-256 file hashes on the MultiversX blockchain, producing tamper-proof, publicly verifiable proofs of existence and ownership.

• Client-side hashing -- SHA-256 is computed locally. Your file never leaves your device.

• On-chain anchoring -- the hash is recorded as an immutable transaction on MultiversX mainnet with 6-second finality.

• Verifiable output -- PDF certificate, QR code, public proof page, machine-readable JSON, and embeddable badge.

• Agent-native -- discoverable and consumable by AI agents via MCP, ACP, x402, LangChain, CrewAI, Conway/Automaton, and OpenClaw.

• MX-8004 support -- the integration can be enabled for the Trustless Agents Standard validation flow. Check /api/mx8004/status for whether it is active; the current production status is not_configured.

Why MultiversX?

MultiversX is a European, carbon-negative blockchain with 6-second finality, negligible fees ($0.001/tx), and a growing ecosystem of AI-native protocols. Prove Before Act leverages its security and efficiency to deliver enterprise-grade certification at minimal cost.

Why It Matters -- Real Scenarios

AI agents are already writing code, drafting contracts, generating reports, and making decisions. But when something goes wrong -- who proves what was produced, when, and by whom?

Prove Before Act is the answer layer.

"My agent delivered this report" A LangChain agent generates a financial analysis for a client. Prove Before Act certifies the output before delivery. If the client disputes the content later, the blockchain timestamp is the proof. Irrefutable. No he-said-she-said.

"This build was not tampered with" Your CI/CD pipeline compiles and ships. Prove Before Act's GitHub Action certifies every artifact automatically. Six months later, a security audit asks: "Is this binary what you deployed?" -- one hash check, case closed.

"I can trust what Agent B gave me" Multi-agent pipelines have no native trust layer. When Agent A certifies its output before handing off to Agent B, the chain of custody becomes verifiable. Agents can prove they did their job. Pipelines become auditable end-to-end.

"Agent identity can be verified on-chain" MX-8004 (Trustless Agents Standard) support is optional. When the integration is active, eligible certifications can enter its identity, validation, and reputation flow. Check /api/mx8004/status before relying on MX-8004 identity or reputation data; production currently reports not_configured.

"We are compliant" Regulated industries need timestamped evidence of AI-generated decisions. Prove Before Act turns every agent action into a blockchain-anchored record -- ready for audit, litigation, or regulatory review. Zero extra work.

"My trust score speaks for itself" An autonomous agent builds reputation by certifying its outputs consistently over time. Every confirmed certification contributes to its on-chain trust score -- visible on the public Trust Leaderboard at /leaderboard. Clients and peer agents query /api/trust/{wallet} before engaging. Trust becomes mathematical, not reputational.

Historical benchmark: the agent identifier xproof_agent_verify is a legacy compatibility name. Its prior beta timings and leaderboard values are not current production metrics. Use a public agent profile and proof response for live status.

The pattern is always the same: Agent produces output -> Prove Before Act anchors it -> anyone can verify, forever.

Pricing

Low flat rate per certification. No tiers, no subscriptions, no monthly fees. Current price is served live at https://provebeforeact.com/api/pricing.

Current pricing: https://provebeforeact.com/api/pricing

Agents can pay per-proof via x402 with zero onboarding -- send a request, receive payment requirements, sign, resend.

Quick Start

Use the API (fastest)

# Certify a file in one call
curl -X POST https://provebeforeact.com/api/proof \
  -H "Authorization: Bearer pm_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "file_hash": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
    "filename": "report.pdf",
    "author_name": "Your Name"
  }'

Response:

{
  "proof_id": "uuid",
  "status": "certified",
  "file_hash": "e3b0c44...",
  "verify_url": "https://provebeforeact.com/proof/uuid",
  "certificate_url": "https://provebeforeact.com/api/certificates/uuid.pdf",
  "proof_json_url": "https://provebeforeact.com/proof/uuid.json",
  "blockchain": {
    "network": "MultiversX",
    "transaction_hash": "txhash...",
    "explorer_url": "https://explorer.multiversx.com/transactions/txhash..."
  }
}

Use the Web App

Go to provebeforeact.com, connect your MultiversX wallet, drop a file, certify. Done.

Self-Host

git clone https://github.com/jasonxkensei/xProof.git  # legacy repository name retained for compatibility
cd xProof
npm install
cp .env.example .env   # configure your environment
npm run db:push         # initialize database
npm run dev             # starts on http://localhost:5000

Prerequisites: Node.js 20+, PostgreSQL (or Neon), MultiversX wallet.

See docs/environment-variables.md for configuration details.

For Developers

POST /api/proof -- Single Certification

Certify one file hash on-chain in a single API call.

curl -X POST https://provebeforeact.com/api/proof \
  -H "Authorization: Bearer pm_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "file_hash": "<64-char-sha256-hex>",
    "filename": "output.txt",
    "author_name": "Agent Name",
    "webhook_url": "https://your-server.com/webhook"
  }'

POST /api/batch -- Batch Certification

Certify up to 50 files in a single call.

curl -X POST https://provebeforeact.com/api/batch \
  -H "Authorization: Bearer pm_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "files": [\
      {"file_hash": "<hash1>", "filename": "file1.txt"},\
      {"file_hash": "<hash2>", "filename": "file2.py"}\
    ],
    "author_name": "Agent Name"
  }'

Verification

Webhooks

When a proof is anchored on-chain, Prove Before Act sends a POST to your webhook_url with HMAC-SHA256 signature in the X-Webhook-Signature header. Retry policy: 3 attempts with exponential backoff.

API Keys

Generate API keys from the Settings page after connecting your wallet. Keys use the pm_ prefix and support per-key rate limiting.

For Agents

Prove Before Act is designed to be discovered, consumed, and paid by autonomous agents across every major protocol.

Universal Compatibility

x402 -- Pay Per Proof, No Account

Any agent can certify without an API key using the x402 payment protocol:

1. Send POST /api/proof without auth

2. Receive HTTP 402 with payment requirements (USDC on Base, eip155:8453)

3. Sign the payment and resend with X-PAYMENT header

4. Receive the proof

Low flat rate per certification. Current pricing: https://provebeforeact.com/api/pricing. No signup. No API key. No account.

MCP -- Model Context Protocol

Prove Before Act exposes a live MCP server at POST /mcp with two tools:

• certify_file -- certify a file hash on MultiversX

• verify_proof -- verify an existing certification

Any MCP-compatible agent can discover and call these tools directly.

ACP -- Agent Commerce Protocol

Full commerce flow for programmatic purchasing:

GET  /api/acp/products       # Discover products and pricing
GET  /api/acp/openapi.json   # OpenAPI 3.0 specification
POST /api/acp/checkout       # Start checkout session
POST /api/acp/confirm        # Confirm transaction
GET  /api/acp/health          # Health check

MX-8004 -- MultiversX Trustless Agents Standard

Prove Before Act supports an MX-8004 validation integration, but support and activation are distinct. The current production response from /api/mx8004/status is status: "not_configured", so certifications are not presently registered in MX-8004.

When configured, the integration exposes identity, validation, reputation, and transaction-queue capabilities. Treat a certification as MX-8004 validated only when its live status response confirms the active integration and validation result.

Conway/Automaton Skill

Prove Before Act ships a ready-made skill for Conway Automatons:

skills/prove-before-act/SKILL.md

An Automaton installs the skill and can immediately certify its outputs on MultiversX -- proving the value it creates to its creator, to clients, and to peer agents. This aligns directly with the Automaton survival-by-work model.

Agent Trust Leaderboard

Every certification builds cumulative on-chain reputation. The Trust Leaderboard makes it public and discoverable.

• Pages: /leaderboard — public, sortable, filterable. /agent/{wallet} — individual profile with stats, streak, and recent certs timeline.

• Trust Score: confirmed_certs × 10 + last_30d × 5 + seniority_bonus (max 150) + streak_bonus (consecutive weeks × 8, max 100)

• Trust Levels: Newcomer (0–99) → Active (100–299) → Trusted (300–699) → Verified (700+)

• Opt-in: Configure your public profile via Settings or PATCH /api/user/agent-profile

• Trust Badge: Embed in any README — GET /badge/trust/{wallet}.svg returns a dynamic shields.io-style badge showing current level and score

Reference agent: xproof_agent_verify is a legacy agent identifier retained for compatibility. Fetch its public profile and proof records for current metrics rather than relying on historic benchmark values.

• Full review: moltbook.com

OpenClaw Skill

ClawHub-standard skill for the OpenClaw ecosystem:

• Repository: github.com/jasonxkensei/xproof-openclaw-skill (legacy repository name retained for compatibility)

• Includes SKILL.md, certify.sh, and full API reference

GitHub Action

Integrate Prove Before Act into your CI/CD pipeline:

- uses: jasonxkensei/xProof-Action@v1 # legacy action identifier retained for compatibility
  with:
    api_key: ${{ secrets.XPROOF_API_KEY }}
    files: dist/**

Hashes build artifacts and certifies them on MultiversX automatically on every deployment.

See github-action/README.md for full documentation.

How It Works

User/Agent                    Prove Before Act                     MultiversX
    |                           |                           |
    |  1. Submit file hash      |                           |
    |     (API / Web / MCP)     |                           |
    |-------------------------->|                           |
    |                           |                           |
    |  2. SHA-256 validated     |                           |
    |     (client-side or API)  |                           |
    |                           |                           |
    |                           |  3. Transaction signed    |
    |                           |     & broadcast           |
    |                           |-------------------------->|
    |                           |                           |
    |                           |  4. Anchored on-chain     |
    |                           |     (6s finality)         |
    |                           |<--------------------------|
    |                           |                           |
    |  5. Proof returned        |  6. MX-8004 validation    |
    |     (JSON + PDF + URL)    |     only when active      |
    |<--------------------------|-------------------------->|
    |                           |                           |
    |  7. Webhook notification  |                           |
    |     (HMAC-signed)         |                           |
    |<--------------------------|                           |

Core Capabilities

API Reference

Full documentation: docs/api-reference.md

Core Endpoints

Authentication

Agent Commerce Protocol

API Key Management

License

Proprietary — source available. See LICENSE.